On 08/09/2013 02:07 PM, Tomasz Chmielewski wrote: > On Fri, 09 Aug 2013 13:56:19 +0800 > Wang Shilong <wangsl.f...@cn.fujitsu.com> wrote: > >>> It seems that btrfs automatically assigns a qgroup to newly created >>> snapshot/subvolume, but does not destroy the qgroup when the >>> subvolume is deleted. >> >> This should be implemented. And will soon. > > Great to hear (using 3.11-rc4 now). > > >>> So I've tried to destroy the unused qgroups, with mixed success. I >>> was able to destroy most of them, but some are still failing, i.e.: >>> >>> # btrfs qgroup destroy 4494 /mnt/lxc1 >>> ERROR: unable to create quota group: Device or resource busy >> >> Just remove qgroup（4494）'s parent qgroup. then it can be removed. >> Anyway, i think this is unnecessary. > > I don't want to remove the parent qgroup, as it's in use by other subvolumes: > > # /usr/src/qgroup/btrfs-progs/btrfs qgroup show -c /mnt/lxc1 | grep 4494 > > 0/4494 839516160 18446744073709481984 --- <------ want to remove only this > one > > 13/1 2142674944 2142674944 > 0/3973,0/3974,0/3978,0/3981,0/4355,0/4373,0/4398,0/4400,0/4401,0/4427,0/4448,0/4449,0/4457,0/4458,0/4475,0/4476,0/4487,0/4488,0/4489,0/4490,0/4491,0/4492,0/4493,0/4494,0/4495,0/4496,0/4497,0/4498,0/4499,0/4506,0/4507,0/4518 > > > Parent qgroup 13/1 makes accounting for other qgroups - therefore, I don't > want to remove it.
Sorry, you must destroy relation between 13/1 and 4494. then you can remove it. thanks, Wang > > > > BTW, "/usr/src/qgroup/btrfs-progs/btrfs" is from > http://github.com/miaoxie/btrfs-progs.git, to support printing parent/child > qgroup IDs. > > Note it shows different values than btrfs from official repository - is that > expected? > > # /usr/src/qgroup/btrfs-progs/btrfs qgroup show /mnt/lxc1 | grep 4494 > 0/4494 839516160 18446744073709481984 > > # btrfs qgroup show /mnt/lxc1 | grep 4494 > 0/4494 839516160 -69632 > -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
